This is one in a series of money-saving tips. For more information, please visit my home page.
When I was searching around for a medicare supplement (also called medigap) I learned that there are a limited number of plans. The plans have letter codes going from A to L and each plan's coverage has been dictated by the federal government. Lots of insurers offer these plans and each insurer is free to set their own price.
But, plan F (one of the most popular) is plan F regardless of the insurer. Each insurer must provide the same coverage for it. Most insurers register your coverage with Medicare so that when you have a claim, Medicare automatically forwards the claim information to them for further processing.
In my state (Illinois) there is a web site that that does a good job of explaning your options.